I'm using the secureblackbox HTTPS server component. The server itself works fine, but when i browse the site, I'm always getting the "untrusted connection" (identity unknown) page in firefox. When i check the certificate in the browser, it seems to be correct (issued by StartCom Ltd.).

The question is what Firefox complains about (you've provided two different error texts in your messages).

Does Firefox show the complete tree of certificates or some certificate(s) are missing?

As an option you can use HTTPGet sample in Samples\C#\HTTPBlackbox\Client directory to connect to your server, and inspect what certificates the client receives from the server and how they are validated. It's possible that the CA and/or root certificates just don't match the end-entity certificate (yes, mistakes can happen on the CA's web site as well).

The validator has OnAfterCertificateValidate event which will tell you what exact certificate fails with this or that error. So far it looks like the CRL is signed by the wrong certificate. But this can be not the only error. While errors can be tolerated when you use our Validator class, they obviously will fire up in browsers .

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